RFM75 Datasheet, PDF (13/27 Pages) List of Unclassifed Manufacturers – Low Power High Performance 2.4 GHz GFSK Transceiver

RFM75 V1.0
ACTIVATE
0101 0000
R_RX_PL_WID
0110 0000
W_ACK_PAYLOAD 1010 1PPP
This write command followed by data 0x73 activates
the following features:
• R_RX_PL_WID
• W_ACK_PAYLOAD
• W_TX_PAYLOAD_NOACK
A new ACTIVATE command with the same data
deactivates them again. This is executable in power
down or stand by modes only.
1
The R_RX_PL_WID, W_ACK_PAYLOAD, and
W_TX_PAYLOAD_NOACK features registers are
initially in a deactivated state; a write has no effect, a
read only results in zeros on MISO. To activate these
registers, use the ACTIVATE command followed by
data 0x73. Then they can be accessed as any other
register. Use the same command and data to
deactivate the registers again.
1 to 32
LSB byte first
This write command followed by data 0x53 toggles
the register bank, and the current register bank
number can be read out from REG7 [7]
Read RX-payload width for the top
R_RX_PAYLOAD in the RX FIFO.
Used in RX mode.
Write Payload to be transmitted together with ACK
packet on PIPE PPP. (PPP valid in the range from 000
to 101). Maximum three ACK packet payloads can be
pending. Payloads with same PPP are handled using
first in - first out principle. Write payload: 1– 32
bytes. A write operation always starts at byte 0.
W_TX_PAYLOAD_NO
ACK
1011 0000
NOP
1111 1111
6.3.2 SPI Timing
SCK
CSN
1 to 32
LSB byte first
0
Used in TX mode. Disables AUTOACK on this
specific packet.
No Operation. Might be used to read the STATUS
register
Table 2 SPI command
MOSI
MISO
MOSI
MISO
W r i t e t o S P I r e g i s t e r:
x
C7 C6 C5 C4 C3 C2 C1 C0 x D7 D6 D5 D4 D3 D2 D1 D0 ^x
HI-Z S7 S6 S5 S4 S3 S2 S1 S0
0
0
00
00
0
0
Hi -Z
R e a d f r o m S P I r e g i s t e r:
x
C7 C6 C5 C4 C3 C2 C1 C0
x
S7 S6 S5 S4 S3 S2 S1 S0
x
D7
D6 D5 D4 D3 D2 D1 D0 ^x
Figure 6 SPI timing
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